<?php
/*
* File: SimpleImage.php
* Author: Simon Jarvis
* Copyright: 2006 Simon Jarvis
* Date: 08/11/06
* Link: http://www.white-hat-web-design.co.uk/articles/php-image-resizing.php
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details:
* http://www.gnu.org/licenses/gpl.html
*
*/
class SimpleImage {
	var $image;
	var $image_type;
	
	function load($filename) {
		$image_info = getimagesize($filename);
		$this->image_type = $image_info[2];
		
		if( $this->image_type == IMAGETYPE_JPEG ) {
			$this->image = imagecreatefromjpeg($filename);
		} elseif( $this->image_type == IMAGETYPE_GIF ) {
			$this->image = imagecreatefromgif($filename);
		} elseif( $this->image_type == IMAGETYPE_PNG ) {
			$this->image = imagecreatefrompng($filename);
		}
	}
	
	function save($filename, $image_type=IMAGETYPE_JPEG, $compression=75, $permissions=null) {
		if( $image_type == IMAGETYPE_JPEG ) {
			imagejpeg($this->image,$filename,$compression);
		} elseif( $image_type == IMAGETYPE_GIF ) {
			imagegif($this->image,$filename);
		} elseif( $image_type == IMAGETYPE_PNG ) {
			imagepng($this->image,$filename);
		}
		if( $permissions != null) {
			chmod($filename,$permissions);
		}
	}
	function output($image_type=IMAGETYPE_JPEG) {
		if( $image_type == IMAGETYPE_JPEG ) {
			imagejpeg($this->image);
		} elseif( $image_type == IMAGETYPE_GIF ) {
			imagegif($this->image);
		} elseif( $image_type == IMAGETYPE_PNG ) {
			imagepng($this->image);
		}
	}
	function getWidth() {
		return imagesx($this->image);
	}
	function getHeight() {
		return imagesy($this->image);
	}
	function resizeToHeight($height) {
		$ratio = $height / $this->getHeight();
		$width = $this->getWidth() * $ratio;
		$this->resize($width,$height);
	}
	function resizeToWidth($width) {
		$ratio = $width / $this->getWidth();
		$height = $this->getheight() * $ratio;
		$this->resize($width,$height);
	}
	function scale($scale) {
		$width = $this->getWidth() * $scale/100;
		$height = $this->getheight() * $scale/100;
		$this->resize($width,$height);
	}
	function resize($width,$height) {
		$new_image = imagecreatetruecolor($width, $height);
		imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
		$this->image = $new_image;
	}
}
/*
 * 
$newfile = UPLOAD_DIR."/icons/".md5($_SESSION['USER']->email).".jpg";//上传文件保存的目录
$image = new SimpleImage();
$image->load($_FILES['icons']['tmp_name']);//上传的临时文件名
$image->resizeToWidth(80);设置宽度
$image->save($newfile);
*/